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With inspiration from other libraries

There is a newer version: 2.12.15

/*
 * Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

package org.antlr.v4.runtime.atn;

public class EmptyPredictionContext extends SingletonPredictionContext {
	public EmptyPredictionContext() {
		super(null, EMPTY_RETURN_STATE);
	}

	@Override
	public boolean isEmpty() { return true; }

	@Override
	public int size() {
		return 1;
	}

	@Override
	public PredictionContext getParent(int index) {
		return null;
	}

	@Override
	public int getReturnState(int index) {
		return returnState;
	}

	@Override
	public boolean equals(Object o) {
		return this == o;
	}

	@Override
	public String toString() {
		return "$";
	}
}